<template>
    <div class="el-tree-select">
        <el-select style="width: 100%" v-model="valueId" ref="treeSelect" :filterable="true" :clearable="true" @clear="clearHandle" :filter-method="selectFilterData" :placeholder="placeholder">
            <el-option :value="valueId" :label="valueTitle">
                <el-tree
                    id="tree-option"
                    ref="selectTree"
                    :accordion="accordion"
                    :data="options"
                    :props="objMap"
                    :node-key="objMap.value"
                    :expand-on-click-node="false"
                    :default-expanded-keys="defaultExpandedKey"
                    :filter-node-method="filterNode"
                    @node-click="handleNodeClick"
                ></el-tree>
            </el-option>
        </el-select>
    </div>
</template>

<script setup lang="ts">
import { watch, getCurrentInstance, computed, ref, nextTick, onMounted } from "vue";
const { proxy } = getCurrentInstance() as any;

const props = defineProps({
    /* 配置项 */
    objMap: {
        type: Object,
        default: () => {
            return {
                value: "id", // ID字段名
                label: "label", // 显示名称
                children: "children", // 子级字段名
            };
        },
    },
    /* 自动收起 */
    accordion: {
        type: Boolean,
        default: () => {
            return false;
        },
    },
    /**当前双向数据绑定的值 */
    value: {
        type: [String, Number],
        default: "",
    },
    /**当前的数据 */
    options: {
        type: Array,
        default: () => [],
    },
    /**输入框内部的文字 */
    placeholder: {
        type: String,
        default: "",
    },
});

const emit = defineEmits(["update:value"]);

const valueId = computed({
    get: () => props.value,
    set: val => {
        emit("update:value", val);
    },
});
const valueTitle = ref("");
const defaultExpandedKey = ref<any[]>([]);

function initHandle() {
    nextTick(() => {
        const selectedValue = valueId.value;
        if (selectedValue !== null && typeof selectedValue !== "undefined") {
            const node = proxy.$refs.selectTree.getNode(selectedValue);
            if (node) {
                valueTitle.value = node.data[props.objMap.label];
                proxy.$refs.selectTree.setCurrentKey(selectedValue); // 设置默认选中
                defaultExpandedKey.value = [selectedValue]; // 设置默认展开
            }
        } else {
            clearHandle();
        }
    });
}
function handleNodeClick(node: any) {
    valueTitle.value = node[props.objMap.label];
    valueId.value = node[props.objMap.value];
    defaultExpandedKey.value = [];
    proxy.$refs.treeSelect.blur();
    selectFilterData("");
}
function selectFilterData(val: any) {
    proxy.$refs.selectTree.filter(val);
}
function filterNode(value: any, data: any) {
    if (!value) return true;
    return data[props.objMap["label"]].indexOf(value) !== -1;
}
function clearHandle() {
    valueTitle.value = "";
    valueId.value = "";
    defaultExpandedKey.value = [];
    clearSelected();
}
function clearSelected() {
    const allNode = document.querySelectorAll("#tree-option .el-tree-node");
    allNode.forEach(element => element.classList.remove("is-current"));
}

onMounted(() => {
    initHandle();
});

watch(valueId, () => {
    initHandle();
});
</script>

<style lang="scss" scoped>
@import "@/assets/styles/variables.module.scss";
.el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
    padding: 0;
    background-color: #fff;
    height: auto;
}

.el-select-dropdown__item.selected {
    font-weight: normal;
}

ul li .el-tree .el-tree-node__content {
    height: auto;
    padding: 0 20px;
    box-sizing: border-box;
}

:deep(.el-tree-node__content:hover),
:deep(.el-tree-node__content:active),
:deep(.is-current > div:first-child),
:deep(.el-tree-node__content:focus) {
    background-color: mix(#fff, $--color-primary, 90%);
    color: $--color-primary;
}
</style>
